Pick roller speeds

ABSTRACT

In some examples, the disclosure describes a printing device that includes a processor resource, and a non-transitory memory resource storing machine-readable instructions stored thereon that, when executed, cause the processor resource to: detect a slippage probability for a pick roller of a print medium to be utilized for a print job of the printing device, determine a speed of the pick roller based on the slippage probability, and instruct the pick roller to be activated at the speed to pick the print medium and move the print medium to a turn roller.

BACKGROUND

Printing devices can generate images on print media by depositing a print substance on the print media. Print media can have a variety of properties. For example, print media can have different thicknesses, coatings, sizes, and/or other properties that can provide different qualities. In some examples, the variety of properties can perform differently within a printing device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a printing device for providing pick roller speeds.

FIG. 2 illustrates an example of a memory resource for providing pick roller speeds.

FIG. 3 illustrates an example of a system for providing pick roller speeds.

FIG. 4 illustrates an example of a system for providing pick roller speeds.

FIG. 5 illustrates an example of a graph for providing pick roller speeds.

DETAILED DESCRIPTION

A user may utilize a computing device for various purposes, such as for business and/or recreational use. As used herein, the term computing device refers to an electronic device having a processor and a memory resource. Examples of computing devices can include, for instance, a laptop computer, a notebook computer, a desktop computer, and/or a mobile device (e.g., a smart phone, tablet, personal digital assistant, smart glasses, a verist-worn device, etc.), among other types of computing devices. Computing devices can be utilized to generate digital images that can be transferred to a printing device (e.g., inkjet printing device, laser printing device, etc.). In these examples, the printing device can generate a printed image of the digital image on a substrate (e.g., paper, plastic, print medium, print media, etc.).

A printing device can generate images on print media. In some examples, the printing device can utilize a print zone to deposit a print substance on the print media to generate an image on the print media based on a corresponding digital image received from the computing device. In some examples, the print media can be positioned within a print media tray of the printing device. As used herein, a print media tray can be a location to store print media to be utilized for a print job of the printing device. In some examples, the printing device can include a pick roller that can interact with the print media to move a sheet of print media to a print path such that the print media is provided to the print zone. In some examples, the pick roller can be utilized to pick a single sheet of print media from a stack of print media within the print media tray and provide the single sheet of print media to the print zone.

In some examples, the type of print media or the properties of the print media can make it difficult for the pick roller to pick a single sheet of print media and/or provide a sheet of print media to the print path. For example, different types of print media can include different thicknesses, different surface tensions, different coatings, among other properties. In some examples, a particular type of pick roller may be capable of picking a first type of print media with a first set of properties while not being capable of picking a second type of print media with a second set of properties. This can be problematic for a printing device to utilize a plurality of different types of print media without malfunctioning.

The present disclosure relates to pick roller speeds. Specifically, the present relates to altering the speed of the pick roller of a printing device based on a number of factors. In some examples, the number of factors can be pre-pick factors and post-pick factors. As used herein a pre-pick factor can be a factor that is determined prior to a start of the pick process or prior to a start of the pick roller attempting to pick print media. As used herein, a post-pick factor can include factors that are determined during the pick process or after the pick process has been complete. For example, a pre-pick factor can be a determination of the type of print media prior to activating the pick roller. In another example, a post-pick factor can be a determination of a distance of rotation of the pick roller compared to a distance traveled by the print media during the pick process. By utilizing the number of factors, the speed (e.g., velocity, acceleration, maximum velocity, etc.) can be altered to improve pick performance of the pick roller for a plurality of different print media types.

FIG. 1 illustrates an example of a printing device 102 for providing pick roller speeds. In some examples, the printing device 102 can include a processor 104 and a memory resource 106 to store instructions that can be executed by the processor 104. In some examples, the printing device 102 can include mechanical components that can generate images on a substrate. For example, the printing device 102 can include inkjet pens that can deposit a print substance on a substrate such as paper. In some examples, the printing device 102 can include a computing device that includes a processor 104 and a memory resource 106 storing instructions 108, 110, 112, that can be executed by the processor 104 to perform particular functions.

The printing device 102 can include instructions 108 stored by the memory resource 106 that can be executed by the processor 104 to detect a slippage probability for a pick roller of a print medium to be utilized for a print job of the printing device 102. As used herein, a slippage probability can be a value that represents a difficulty of performing a pick operation by the pick roller. For example, the slippage probability can be a value that represents a success probability for performing a pick operation under particular conditions or based on a plurality of factors of the print job. In some examples, the slippage probability can be based on a type of print media within the print media tray, a quantity of print media within the media tray, and/or a type of material of the pick roller of the printing device 102.

In some examples, the type of print media can be identified by a sensor within the print media tray. For example, a size detection sensor can be implemented within the print media tray to identify the size and/or shape of the print media. In other examples, composition sensors can be utilized to determine whether a particular coating has been applied to the print media. For example, a composition sensor can determine a reflectiveness of the print media to determine if a particular coating is applied to the print media. In some examples, the type of print media can be provided to the printing device 102 through a user interface and data corresponding to the selected type of print media for the print job can be utilized to calculate the slippage probability. In some examples, the slippage probability can be utilized to select a particular pick profile for the pick roller. In some examples, the pick profile can include a particular pick speed for the pick roller. As used herein, a pick speed can include a particular rotational velocity and/or a particular rotational acceleration for the pick roller. In this way, the velocity and acceleration of the pick roller can be adjusted based on the particular type of print media identified in the print media tray.

In some examples, the slippage probability can be based on a notification from a sensor that the print medium is a particular type of print medium. As described herein, the sensor can be utilized to determine when the print medium includes particular properties that can make it more difficult for a pick roller to provide a frictional force on the print media. As used herein, a frictional force is a force that is created through the interaction between two surfaces. For example, the frictional force between the pick roller and the print medium can occur when the surface of the pick roller is interacting with a surface of the print medium. In some examples, the pick roller can use the frictional force to move the print medium toward a turn roller.

In some examples, the slippage probability can be based on the pick roller exceeding a threshold distance compared to a distance traveled by the print medium. As described further herein, the slippage probability or a slippage event can be determined when the rotational distance of the pick roller exceeds a threshold distance compared to the distance traveled by the print medium. That is, when the pick roller is rotating and the print medium is not moving a corresponding distance, it can be determined that the pick roller is not successfully moving the print medium at the current speed or pick profile. In a similar way, the slippage probability can be based on a detected drop in torque of the pick roller. Torque can be created between the pick roller and the print medium when the frictional force between the pick roller and the print medium allows the pick roller to move the print medium. However, during a slippage event, the frictional force may not be moving the print medium and the torque of the pick roller can drop below a threshold torque, which can indicate that the pick roller is slipping over the surface of the print medium and not moving the print medium toward a turn roller.

In some examples, the slippage probability can be based on a quantity of print media within the print media tray. For example, a first quantity of print media within the print media tray can have a first set of factors for the pick roller being able to pick and separate a sheet of print media from the quantity or stack of print media compared to a second quantity of print media. In some examples, a greater quantity of print media can be more difficult to pick from than a lower quantity of print media. In this way, a greater quantity of print media can have a relatively higher slippage probability compared to a lower quantity of print media.

In some examples, the quantity of print media can be determined by a sensor within the print media tray. In some examples, these sensors can be utilized to notify a user when the printing device 102 is running low on print media. In these examples, force and/or resistance to separation for a top sheet with a relatively greater quantity of print media can be greater than for a top sheet with a relatively lower quantity of print media. In this way, a first pick profile can be utilized when there is a first quantity of print media that exceeds a threshold quantity, and a second pick profile can be utilized when there is a second quantity of print media that is below the threshold quantity. In other examples, a plurality of threshold quantities can correspond to a plurality of pick profiles for a particular type of print media as described herein.

The printing device 102 can include instructions 110 stored by the memory resource 106 that can be executed by the processor 104 to determine a speed of the pick roller based on the slippage probability. As described herein, the speed of the pick roller can refer to the velocity and/or the acceleration of the pick roller over a period of time. In some examples, the speed of the pick roller can be associated with a particular selected pick profile for the determined type of print media to be picked by the pick roller. In some examples, the speed of the pick roller can be inversely proportional to the slippage probability. That is, a higher probability of slippage can result in a pick profile with a relatively lower speed for the pick operation.

In some examples, the speed (e.g., velocity and/or acceleration) can be lowered to a minimum speed when the slippage probability exceeds a threshold value. For example, a particular type of print media with a particular type of coating can be relatively difficult for the pick roller to pick without slippage. In this example, the speed of the pick roller can be lowered to a minimum maximum velocity and/or acceleration. In this way, a maximum velocity for the pick roller can be lower than for other types of print media with a relatively lower slippage probability and the quantity of time it takes for the pick roller to reach the maximum velocity can be relatively greater. In this way, the velocity and/or acceleration of the pick roller can be altered based on the type of print media to increase the consistency of a successful pick operation.

In some examples, the printing device 102 can apply a braking to the pick roller when the pick roller exceeds a threshold distance compared to a distance traveled by the print medium. As described herein, a slippage event can be determined and the speed of the pick roller can be lowered to a slower speed. In some examples, this can be achieved through a braking process. As used herein, a braking process includes applying a braking mechanism to the pick roller or drive shaft of the pick roller to slow the rotational speed of the pick roller even when a drive motor is moving at a constant speed. In this way, a drive motor may not have to make relatively small speed adjustments to the pick roller.

The printing device 102 can include instructions 112 stored by the memory resource 106 that can be executed by the processor 104 to instruct the pick roller to be activated at the speed to pick the print medium and move the print medium to a turn roller. As described herein, the pick profile can be selected that includes a particular speed for the pick process. That is, the pick profile can identify the maximum velocity for the pick operation and an acceleration for the pick operation. When the pick profile or speed is determined for the particular type of print medium, the printing device 102 can activate the pick roller and perform the pick operation utilizing the pick profile.

As described further herein, the pick profile can also include information for responding to post-pick factors. For example, the pick operation can begin with the pick profile or speed that is determined based on the type of print media and be altered during the pick operation based on the post-pick factors that are determined during the pick operation. For example, the post-pick factors can include, but are not limited to: a rotational distance of the pick roller, a distance traveled by the print media to be picked, a torque of the pick roller, among other factors that can be monitored during the pick process.

As described herein, the printing device 102 can include computing device that can include a processor 104 communicatively coupled to a memory resource 106. The computing device can include components such as a processor 104. As used herein, the processor 104 can include, but is not limited to: a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a metal-programmable cell array (MPCA), a semiconductor-based microprocessor, or other combination of circuitry and/or logic to orchestrate execution of instructions 108, 110, 112. In other examples, the computing device can include instructions 108, 110, 112, stored on a machine-readable medium (e.g., memory resource 106, non-transitory computer-readable medium, etc.) and executable by a processor 104. In a specific example, the computing device utilizes a non-transitory computer-readable medium storing instructions 108, 110, 112, that, when executed, cause the processor 104 to perform corresponding functions.

FIG. 2 illustrates an example of a memory resource 206 for providing pick roller speeds. In some examples, the memory resource 206 can be a part of a computing device or controller that can be communicatively coupled to a computing system. For example, the memory resource 206 can be part of a printing device 102 as referenced in FIG. 1 . In some examples, the memory resource 206 can be communicatively coupled to a processor 204 that can execute instructions 222, 224, 226, stored on the memory resource 206. For example, the memory resource 206 can be communicatively coupled to the processor 204 through a communication path 214. In some examples, a communication path 214 can include a wired or wireless connection that can allow communication between devices and/or components within a single device.

The memory resource 206 may be electronic, magnetic, optical, or other physical storage device that stores executable instructions. Thus, a non-transitory machine-readable medium (MRM) (e.g., a memory resource 206) may be, for example, a non-transitory MRM comprising Random-Access Memory (RAM), read-only memory (ROM), an Electrically-Erasable Programmable ROM (EEPROM), a storage drive, an optical disc, and the like. The non-transitory machine-readable medium (e.g., a memory resource 206) may be disposed within a controller and/or computing device. In this example, the executable instructions 222, 224, 226, can be “installed” on the device. Additionally, and/or alternatively, the non-transitory machine-readable medium (e.g., a memory resource) can be a portable, external or remote storage medium, for example, that allows a computing system to download the instructions 222, 224, 226, from the portable/external/remote storage medium. In this situation, the executable instructions may be part of an “installation package”. As described herein, the non-transitory machine-readable medium (e.g., a memory resource 206) can be encoded with executable instructions for altering a speed (e.g., velocity, acceleration, maximum velocity, minimum velocity, etc.) of a pick roller during a pick process.

In some examples, the memory resource 206 can include instructions 222 to instruct a pick roller to rotate at a first speed to pick a print medium to provide the print medium to a turn roller from a print media tray. As described herein, the first speed can be based on a pick profile that can be determined based on the type of print media. In other examples, the first speed can be a default or initial speed that can be utilized for all types of print media. In some examples, the first speed can correspond to a first velocity, a first maximum velocity, and/or a first acceleration for the pick process. In this way, the first speed can be a first speed profile or first pick profile that is utilized by the pick roller.

In some examples, the memory resource 206 can include instructions 224 to determine a slippage event of the pick roller based on a rotation of the pick roller and a distance traveled by the print media from the print media tray. As used herein, a slippage event can be an event where a surface of the pick roller slips past a surface of the print media without moving the print media or moving the print media at a slower speed than a threshold speed. For example, the slippage event can include an event when torque of the pick roller is not transferred to the print media. In this way, the pick roller may not be move the print media to a turn roller or print path to the print zone.

In some examples, the slippage event can be detected based on factors determined or sensed during a pick operation. For example, the factors of the slippage event can include, but are not limited to: a rotational distance of the pick roller compared to a distance traveled by the print media, a torque of the pick roller, a speed increase of the pick roller, and/or other factors associated with the pick roller and/or print media during the pick operation. In these examples, the plurality of factors can be monitored during the pick operation and the speed of the pick roller can be altered based on the monitored plurality of factors.

In some examples, the memory resource 206 can include instructions 226 to instruct to pick roller to rotate at a second speed to pick the print medium to provide the print medium to the turn roller from the print media tray. In these examples, the second speed is slower than the first speed. In some examples, the slippage event can indicate that the pick roller is not moving the print media when the pick roller is rotating. In these examples, the speed of the pick roller can be altered from the first speed to the second speed. In some examples, the first speed can correspond to a first pick profile for the pick roller and the second speed can correspond to a second pick profile for the pick roller.

In some examples, the pick roller can be altered from the first speed to the second speed in response to a failed pick process at the first speed. For example, the slippage event can be an indication that the pick roller was not able to perform a pick of the print media at the first speed or utilizing the first speed profile. In these examples, the pick roller can be instructed to attempt the pick operation utilizing the second speed. In some examples, the plurality of factors can be monitored during the pick operation utilizing the second speed to determine if a slippage event occurs at the second speed.

In some examples, the indication of a slippage event can be an indication that the speed or pick profile is to be lowered. For example, the second speed can be lower than the first speed. In this example, the maximum velocity of the pick roller can be lower at the second speed compared to the first speed. In this example, an acceleration at the second speed can be lower than an acceleration at the first speed. In some examples, the lower speed (e.g., maximum velocity, acceleration, etc,) can allow the pick roller to maintain contact with the surface of the print media and allow the pick roller to move the print media out of the print media tray toward the print zone of the printing device.

In some examples, the memory resource 206 can include instructions to instruct a brake to apply braking of the pick roller to alter a speed of the pick roller from the first speed to the second speed. As described herein, a brake can be a mechanical device that can apply pressure or resistance to a drive shaft of the pick roller to alter the speed of the pick roller from a relatively faster speed to a relatively slower speed.

FIG. 3 illustrates an example of a system 300 for providing pick roller speeds. In some examples, the system 300 can include a printing device 302 and a controller 340 for executing instructions associated with the printing device 302. The controller 340 can be communicatively coupled to the printing device 302 through a communication path 314. The printing device 302 can include a print zone 352 to deposit a print substance on a print medium 358.

The controller 340 can be a device that includes a processor communicatively coupled to a memory resource. In other examples, the controller 340 can be a device that includes hardware, such as an ASIC to perform particular functions 342, 344, 346, 348, 350. In some examples, the controller 340 can perform the functions for the printing device 302 through a communication path 314. In some examples, the controller 340 can be a device within the enclosure of the printing device 302.

At 342, the controller 340 can include instructions to determine a type of print media 358 within the media tray 360. In some examples, the type of print media 358 within the media tray 360 can describe a plurality of features of the print media 358. For example, the type of print media 358 can be utilized to identify a size, thickness, coating, and/or other properties of the print media 358. In some examples, the type of print media 358 within the media tray 360 can be selected at the printing device 302.

In some examples, the media tray 360 can include a sensor to identify the size, thickness, coating and/or other properties of the print media. For example, a size indicator sensor can be utilized to determine the size of the print media 358 by altering media guides within the media tray 360. In other examples, visual sensors can be utilized to determine a thickness or texture of the print media 358 within the media tray 360. For example, a visual sensor can be utilized to determine when the print media 358 includes a particular type of coating which may affect the ability of the pick roller 354 to interact with the print media 358.

At 344, the controller 340 can include instructions to determine a speed to be utilized by the pick roller 354 for the type of print media 358. As described herein, the speed of the pick roller 354 can refer to a velocity, maximum velocity, and/or acceleration associated with the pick roller 354 during a pick process. In some examples, the speed of the pick roller 354 can be defined by a particular pick profile that can correspond to the particular type of the print media 358 and/or the particular properties of the print media 358. In some examples, the determined speed can be based on the pre-pick factors associated with the pick process of the print media 358. That is, the speed or pick profile for the pick roller 354 can be based on the factors of the print media 358 prior to the pick roller 354 being activated to perform the pick process of the print media 358.

At 346, the controller 340 can include instructions to instruct the pick roller 354 to rotate at the determined speed. When the speed or pick profile for the pick roller 354 is determined for the print media 358, the controller 340 can activate the pick roller 354 at the determined speed and/or utilizing the velocity and acceleration defined by the pick profile. In this way, the acceleration and/or maximum velocity for the pick roller 354 can be defined based on the type of print media 358 to be picked.

At 348, the controller 340 can include instructions to alter the speed of the pick roller 354 in response to a detected slippage event to a lower speed. As described herein, a slippage event can refer to an event where the pick roller 354 is rotating without moving the print media 358 toward the turn roller 356. In some examples, the slippage event can be detected when the pick roller 354 is rotating at the determined speed or utilizing the determined pick profile with the corresponding velocity and acceleration. In this way, the slippage event can indicate that the pick process at the determined speed may fail to pick the print media 358 and/or provide the print media 358 to the turn roller 356.

In some examples, the controller 340 can alter the speed of the pick roller 354 to a different speed that is slower than the determined speed. In some examples, this deceleration or lowering of the speed can increase a torque provided on the print media 358 and allow the force of the pick roller 354 to be transferred to the surface of the print media 358. In some examples, the controller 340 can stop the pick process at the determined speed, update the pick profile or speed of the pick roller 354 and start the pick process with the updated pick profile or updated speed. In this way, the controller 340 can determine during a pick process that the properties of the print media 358 are such that a different pick profile or speed may be needed to transfer the print media 358 to the turn roller 356.

In some examples, the properties of the pick roller 354 can change over a period of use or throughout the life cycle of the printing device 302. For example, some coatings of print media 358 can be transferred to the pick roller 354 and alter the properties of the pick roller 354 . In this way, the controller 340 can determine during a pick process that the interaction between a current state of the pick roller 354 and the type of print media 358 is allowing slippage, which can lead to failures to provide the print media 358 to the turn roller 356. In some examples, the pick profile for the type of print media 358 can be updated such that the updated pick profile or speed for the pick roller 354 is utilized for future print jobs utilizing the print media 358.

At 350, the controller 340 can include instructions to instruct the pick roller 354 to deactivate when the print media 358 travels a particular distance. In some examples, the particular distance can be a distance between the pick roller 354 and the turn roller 356. In this way, the pick roller 354 can be deactivated to allow the turn roller 356 to interact with the print media 358 and provide the print media 358 to a print zone 352 of the printing device 302. In some examples, the pick roller 354 can be deactivated by deactivating a pick roller motor that is coupled to the pick roller 354 and/or to disengage a drive train from a gear box of the pick roller 354.

FIG. 4 illustrates an example of a system 400 for providing pick roller speeds. In some examples, the system 400 can represent the hardware for rotating the pick roller 454 of a printing device. For example, the system 400 can include a first type of hardware on the left side of line 470 and a second type of hardware on the right side of line 470. In some examples, the left side of the line 470 can illustrate a first motor 472 (e.g., turn roller motor, etc.) that can be utilized to rotate a turn roller 456 and a second motor 474 (e.g., pick roller motor, etc.) to rotate a pick roller 454. In some examples, the turn roller motor can rotate the turn roller and the turn roller motor can be separate from the pick roller motor coupled to the pick roller.

In some examples, the left side of line 470 can also include a clear box 476 to allow a corresponding drive train or gear box associated with the first motor 472 to provide additional power to the pick roller 454. In some examples, the gear box 476 can include a plurality of gears that can correspond to the drive train of the first motor 472 and be driven by the first motor 472 in a first position. In these examples, the drive train of the first motor 472 can be moved to a second position to stop providing power to the pick roller 454 and disengage with the gear box 476. In this way, the first motor 472 and the second motor 474 can be utilized to provide rotational power to the pick roller 454 to rotate the pick roller 454 at a particular speed or pick profile.

In some examples, the right side of the line 470 can illustrate when the second motor 474 is removed from the system 400. In these examples, the first motor 472 can provide power to the pick roller 454 and can deactivate the pick roller 454 by moving from the first position to the second position to disengage the drive train of the first motor 472 from the gear box 476. In these examples, the first motor 472 can be utilized to provide the power for the pick roller 454 to provide the speed or pick profile for the pick roller 454.

FIG. 5 illustrates an example of a graph 580 for providing pick roller speeds. In some examples, the graph 580 can illustrate a first pick profile 586 and a second pick profile 588. In some examples, the graph 580 can include an x-axis 584 that represents time in seconds and a y-axis 582 that represents velocity in inches per second. In some examples, the y-axis 582 represents the rotational velocity of a pick roller during a pick operation.

In some examples, the first pick profile 586 can have a first acceleration and the second pick profile 588 can have a second acceleration that is lower than the first acceleration. For example, the first pick profile 586 can have an acceleration of 0.5 G and the second pick profile 588 can have an acceleration of 0.1 G. In this example, the first pick profile 586 can have an acceleration that is five times greater than the second pick profile 588. As illustrated by the graph 580, the second pick profile 588 can provide a grip or interaction force between the pick roller (e.g., pick tire, etc.) and the print media compared to the first pick profile 586. In this way, the second pick profile 588 can be utilized when picking the particular type of print media.

In the foregoing detailed description of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration how examples of the disclosure may be practiced. These examples are described in sufficient detail to enable those of ordinary skill in the art to practice the examples of this disclosure, and it is to be understood that other examples may be utilized and that process, electrical, and/or structural changes may be made without departing from the scope of the disclosure. Further, as used herein, “a” refers to one such thing or more than one such thing.

The figures herein follow a numbering convention in which the first digit corresponds to the drawing figure number and the remaining digits identify an element or component in the drawing. For example, reference numeral 102 may refer to element 102 in FIG. 1 and an analogous element may be identified by reference numeral 302 in FIG. 3 . Elements shown in the various figures herein can be added, exchanged, and/or eliminated to provide additional examples of the disclosure. In addition, the proportion and the relative scale of the elements provided in the figures are intended to illustrate the examples of the disclosure, and should not be taken in a limiting sense.

It can be understood that when an element is referred to as being “on,” “connected to”, “coupled to”, or “coupled with” another element, it can be directly on, connected, or coupled with the other element or intervening elements may be present. In contrast, when an object is “directly coupled to” or “directly coupled with” another element it is understood that are no intervening elements (adhesives, screws, other elements) etc.

The above specification, examples, and data provide a description of the system and methods of the disclosure. Since many examples can be made without departing from the spirit and scope of the system and method of the disclosure, this specification merely sets forth some of the many possible example configurations and implementations. 

What is claimed is:
 1. A printing device, comprising: a processor; and a non-transitory memory resource storing machine-readable instructions stored thereon that, when executed, cause the processor to: detect a slippage probability for a pick roller of a print medium to be utilized for a print job of the printing device; determine a speed of the pick roller based on the slippage probability; and instruct the pick roller to be activated at the speed to pick the print medium and move the print medium to a turn roller.
 2. The printing device of claim 1, wherein the slippage probability is based on a notification from a sensor that the print medium is a particular type of print medium.
 3. The printing device of claim 1, wherein the slippage probability is based on the pick roller exceeding a threshold distance compared to a distance traveled by the print medium.
 4. The printing device of claim 1, wherein the slippage probability is based on a detected drop in torque of the pick roller.
 5. The printing device of claim 1, wherein the slippage probability is based on a pick roller type of the pick roller and an indication of a selected type of print medium at the printing device.
 6. The printing device of claim 1, wherein the speed of the pick roller is initiated at a minimum speed when the slippage probability is above a threshold value.
 7. The printing device of claim 1, wherein the processor is to apply a braking to the pick roller when the pick roller exceeds a threshold distance compared to a distance traveled by the print medium.
 8. A non-transitory memory resource storing machine-readable instructions stored thereon that, when executed, cause a processor of a computing device to: instruct a pick roller to rotate at a first speed to pick a print medium to provide the print medium to a turn roller from a print media tray; determine a slippage event of the pick roller based on a rotation of the pick roller and a distance traveled by the print media from the print media tray; and instruct to pick roller to rotate at a second speed to pick the print medium to provide the print medium to the turn roller from the print media tray, wherein the second speed is slower than the first speed.
 9. The memory resource of claim 8, wherein the processor is to apply braking of the pick roller to alter a speed of the pick roller from the first speed to the second speed.
 10. The memory resource of claim 8, wherein the slippage event is determined based on a change in torque of the pick roller at the first speed.
 11. The memory resource of claim 8, wherein the slippage event is determined when the rotation of the pick roller exceeds a threshold distance for the distance traveled by the print media.
 12. A system, comprising: a media tray to store print media; a pick roller coupled to a motor to interact with the print media within the media tray; a turn roller to receive print media provided by the pick roller; and a controller to; determine a type of print media within the media tray; determine a speed to be utilized by the pick roller for the type of print media; instruct the pick roller to rotate at the determined speed; alter the speed of the pick roller in response to a detected slippage event to a lower speed; and instruct the pick roller to deactivate when the print media travels a particular distance.
 13. The system of claim 12, wherein the motor is utilized to move the pick roller and the turn roller.
 14. The system of claim 12, comprising a turn roller motor to rotate the turn roller, wherein the turn roller motor is separate from the motor coupled to the pick roller.
 15. The system of claim 12, wherein the speed to be utilized by the pick roller is based on the type of print media and a material of the pick roller. 